January Challenge 2015
Queries on the String, Sereja and Number Division 2, Chef and A Large Permutation, Chef and Stones, Sereja and Votes, One Dimensional Kingdoms, Gcd Queries
February Challenge 2015
Chef and Strings, Chef and Equality, Let us play with rank list, Chef and Strange Formula, Time to Study Graphs with Chef, Chef and Chain
March Challenge 2015
Count Substrings, Chef and Notebooks, Chef and Problems, Devu and his Class, Sign Wave, Matrix
April Challenge 2015
Count Sequences, Chef and Piano Scales, Inversion sorting, Chef and Interview, Chef and Array, Broken Telephone
May Challenge 2015
Devu and binary String, Chef and Prime Divisors, Set Difference , Chef and new recipe, Chef and Cake
June Challenge 2015
Chef and His Friend, Chef and Polygons, Chef and Memory Limit, Steady tables
December Challenge 2015
Chef and cinema, Chef and the stones, Plane Division, Oracle Devu and Longest Common Subsequence, Chef and Filters, Chef and Girls
